Here are a few fun things to do with homeschoolers when you're sick -
Watch The Princess Bride, possibly the best movie ever made.
Send your 8 year-old to CoolMath.com (and then after you kick him off the computer, get hooked on it yourself).
Put the 4 year-old in front of Sesame Street, then pull out all his knight stuff and let him roar his way around the house. Think to yourself, "at least it's happy noise..."
Pull out the play dough. Because you can't talk, which if you are like me creates an intense no-speech vacuum, marvel at the interesting, funny, intelligent things your children say.
Realize how glad you are that you have these little beings to keep you company.